Results 271 to 280 of about 38,375 (314)

Surface Wave Inversion for Shear Wave Velocity

1991
Land based seismic exploration has typically viewed the surface wave or ground roll as undesirable noise while earthquake seismology has been able to use the surface wave to invert for lateral variations in crust-upper mantle shear-wave velocity. Although surface-wave inversion techniques for shear-wave velocity and shear-wave Q are easy to apply once ...
R. B. Herrmann, G. I. Al-Eqabi
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Estimation of seabed shear-wave velocity profiles using shear-wave source data

The Journal of the Acoustical Society of America, 2013
This paper estimates seabed shear-wave velocity profiles and their uncertainties using interface-wave dispersion curves extracted from data generated by a shear-wave source. The shear-wave source generated a seismic signature over a frequency range between 2 and 60 Hz and was polarized in both in-line and cross-line orientations. Low-frequency Scholte-
Hefeng, Dong, Thanh-Duong, Nguyen, Kenneth, Duffaut   +2 more
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On linear wave motions in magnetic-velocity shears

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1977
Abstract The propagation properties of linear wave motions in magnetic and/or velocity shears which vary in one coordinate z (say) are usually governed by a second order linear ordinary differential equation in the independent variable z. It is proved that associated with any such differential equation there always exists a quantity A
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Shear wave velocity in surface sediments

Jökull, 2011
Surface sediments of different nature are common in Iceland. Natural soil sites and man-made fillings commonly serve as foundations for different types of structures. In Civil engineering work it is fundamental to know the geotechnical properties of these materials in the upper 20–30 m.
Bjarni Bessason, Sigurður Erlingsson
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Shear wave velocities in the Earth's mantle

Physics of the Earth and Planetary Interiors, 1972
Direct measurement of the travel time gradient for S waves together with travel time data are used to derive a shear velocity model for the earth's mantle. In order to satisfy the data it is necessary to discard the usual assumption of lateral homogeneity below shallow depths.
Russell Robinson, Robert L. Kovach
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Shear Wave Velocity in Marine Sediment

Japanese Journal of Applied Physics, 2006
The shear wave velocity in surficial marine sediment is important evaluating the physical properties of such sediment. In this study, the dispersion of the shear wave velocity is investigated using the Biot–Stoll model. Next, the shear wave velocities of air- and water-saturated beach sands are measured at a low overburden stress, and the shear moduli ...
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Means for obtaining shear wave velocities

The Journal of the Acoustical Society of America, 1989
The present invention provides a method of logging a subterranean formation through a wellbore containing a fluid, wherein no shear wave signal is obtainable utilizing conventional sonic well logging tools suspended in the wellbore. The shear wave signal is not obtainable usually because the acoustic velocity of the wellbore fluid is greater than the ...
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Seafloor shear wave velocity variability.

The Journal of the Acoustical Society of America, 1992
In gross classification, sediments of the deep seafloor may be of terrigenous or marine origin. Those of marine origin are classified as oozes (generally calcareous) or clays (generally siliceous) depending largely on whether their CaCO3 content is greater or less than 30%.
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Shear wave velocities in the lower mantle

Bulletin of the Seismological Society of America, 1969
abstract The Large Aperture Seismic Array in eastern Montana was used to measure the travel times and dT/dΔ of earthquake-generated shear waves for the purpose of determining lower-mantle shear velocities. The data were limited to epicentral distances between 27 and 95 degrees.
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Measuring Shear Wave Velocity Using Bender Elements

Geotechnical Testing Journal, 2005
Abstract The use of bender element to measure shear wave velocity is popular due to its simplicity. However, there are still some uncertainties in the interpretation of the bender element test. In this paper, the use of bender elements in the determination of shear wave velocities of dry, unsaturated, and saturated soil specimens is ...
Leong, Eng Choon, Yeo, Sir Hoon, Rahardjo, Harianto   +2 more
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